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Error Code

[Error Code] EC-321, 324, 325, 326. Nozzle Fan Error

***All contents are the same as the EC-321 and 322 information of the existing DP200 models. ***


Before the error occurs, check if the fan below rotates, and if the fan does not rotate, take the following steps.​ 



※ While checking the nozzle, if necessary, refer to '5. Maintenance' and '4.4 Nozzle Replacement' in the User Manual to remove and assemble the nozzle.​


1. Visually check for alien substances. (Filament Debris, etc.) 

   Visually check alien substances inside the fan and if finding any alien substances, remove them with tweezers.


   ※ Note that the white-black-red color line in the photo below is a fan harness. 

      They are not alien substances.



2. Check if it spins by hand 

   Spin the fan by hand and check if there is any noise or interference.

   (Compared to the normal fan in the nozzle)


3. Check if EC error occurs after power on 

[Error Code] EC 401/601 occurs

[STEP 1]

1-1. Check the nozzle number where the problem occurred and select the extruder menu.

1-2. Wait until the nozzle temperature reaches the target temperature.

1-3. Through the extruder operation mode, transfer filament about 50mm in the direction of inserting the filament into the nozzle.

    (Select the nozzle where the problem occurred, select the transfer length 50)




1) If the filament is ejected, continue printing. If the problem persists even after, proceed to [STEP 3].

2) If the filament does not exit the nozzle, proceed to [STEP 2]. 


[STEP 2]

2-1. Remove the snap ring on the top of the nozzle, remove the tube, and transfer it about 50 mm in the direction of inserting the filament into the nozzle, using the extruder menu.

2-2. Check if the filament moves in the direction to nozzle.


For details on how to disassemble and assemble the snap ring and tube, refer to Chapter 5, “1.5 Cleaning the Nozzle Inside”.


1) If the filament moves in the nozzle direction, cut off the thick part of the filament end obliquely, reassemble the tube and snap ring, and proceed to [STEP 1] again. If the filament ejection is still not possible through the nozzle in [STEP 1], proceed according to “1.5 Cleaning the inside of the nozzle” in Chapter 5 of the User Manual.

2) If the filament does not move, proceed as follows.

ⓐ Select a cartridge which number is same as the trouble encountered nozzle's number and proceed unloading.

ⓑ Remove the cartridge from the printer.

ⓒ Open the cartridge and check if the filament is twisted. 



If there is no problem inside the cartridge and the filament cannot be transported in [STEP 2], contact the customer service.  


[STEP 3]

3-1. Proceed to "1.5 Cleaning the inside of the nozzle" in Chapter 5 of the User Manual.

3-2. If notification 601 occurs, clean the encoder with the encoder cleaning brush as shown below. (When notification 401 occurs, only the inside of the nozzle is cleaned.)

3-3. Remove the snap ring from the tube holder of the nozzle and remove the tube.

3-4. Put the encoder cleaning brush inside the tube holder and move it up and down about 10 times to clean it.

3-5. After cleaning, insert the tube again and fit the snap ring.


For details on how to disassemble and assemble the snap ring and tube, refer to Chapter 5, “1.5 Cleaning the Nozzle Inside”.  

If notification 401 or notification 601 continues to occur even after cleaning  the nozzle inside and cleaning the encoder, contact the customer service. 

[Error Code] EC 487 Filament detection error

1. Before loading the cartridge, make sure the filament does not stick out of the cartridge (at least 2 mm away from the end of the tube)

2. Before loading the cartridge, make sure the tube does not stick out of the cartridge (at least 2 mm away from the end of the tube)

If the tube is sticking out of the cartridge, please push the tube back into the cartridge case.  

The tube should be about 2 mm inside the cartridge case as shown in the image below. 

3. Make sure the flag is moving naturally (Refer to the linked video. )


DP200 normal flag motion video

3DWOX1 normal flag motion video

2X normal flag motion video


Please remove impurities which disturb the flag movement.


[Error Code] EC 411/412 ( 611/612) Filament sensor/Extruder sensor error

Please follow checklist below.

Cartridge mode            (EC 411/412)      : Step 4 ~ Step 6 ​

Open filament mode    (EC 611/612)      : Step 1 ~ Step 5


1. Check the filament loading position referring to the image below. 


                  Normal state                                                                      Abnormal state


2. If you use the cartridge case with wide 3rd party filament spool, it can make the problem.

Some of the 3rd party filament is wider than cartridge case so filament transfer will be disturbed.


3. Please check the diameter of filament. It should be 1.75mm.  


4. Filament in tube

Can you see the filament in the red circled area?

If you can see the filament, please remove the filament by following the FAQ.

If you cannot see the filament in that area, twist the brass fitting and remove it.

After removing the brass fitting, can you transfer the filament without clogging?

In this state, you can manually push the filament from loading area so that help the extruder works. 

5. Flag

Make sure the flag is moving naturally. 

Sample video link : DP200 


If the flag doesn't move naturally, please remove the impurities which disturb the flag motion.  

Please pull out the filament or impurity by using long nose pliers. ​


6. Cartridge check

1) Check if the gear in cartridge rotates well.⇒ If not, open the cartridge and check if there is a tangle of cartridge.


2) If yes, turn the gear until the filament comes out from cartridge. ⇒ If the filament doesn't come out, open the cartridge and check if roller holds the filament or not.

3) If the filament comes out, pull out the filament about 50~60mm, and cut it. ⇒  Re-install the cartridge and load again.



*Be careful for the end tip of filament to have the shape like the below after cutting.   



If the problems persist, please contact the Customer Service.

( )  

[Error Code] EC 302 / EC 306, Nozzle temperature control error
* EC 302 and 306 both occur in the same Nozzle area. (Thus, these two share a solution.)
- EC 302 : This error occurs when the temperature doesn't rise above 10ºC within 30 s from the initiation of heater.
- EC 306 : This error occurs when the difference between the targeting temperature and device temperature is over 20ºC and continues more than 5 mins. 

1. Turn off the device, open the nozzle cover, and detach the connector (connected to the red harness) on the right.
Refer to the Page 130 of the User Manual.
(Go to Chapter 5 Maintenance -> 4.4 Exchanging Nozzle  #3, #4)


2. Check the interior of the connector of the nozzle and the main board to see if there are any impurities.


3. If no impurities are found, reattach the connector.
Push the red harness towards the direction of the connector one to two times to check
whether the connector is properly connected (Do not pull it out)


4. Turn the device back on and check if EC-306 or another Error Code still occurs.


[Error Code] EC 311, Nozzle Z Sensor error
1. Phenomenon
Nozzle Sensor status does not change after Booting 3DWOX.


2. Causes
  1) Faulty Nozzle Sensor 
  2) Incomplete installation of the Bed 

3. Check List
  1) Make sure that the Nozzle Assy is properly attached.
  - If the Nozzle is out of position, please refer to the '5. Maintenance - 5-12 Assembling the Nozzle', reposition the Nozzle and close the Upper Cover.


  - Check and Make sure that the Upper Cover is holding firmly.


  2) Power off the 3DWOX and move the nozzle to the leftmost position to check if the sensor is working properly.
  - If the Nozzle is pushed all the way to the left wall, there will be a click sound. When the Nozzle is pulled back rightward, the sensor status changes.
  - If the Nozzle is once again pushed to the left, there will be a click sound and the sensor status is switched again.

  - After Checking the Nozzle Multiple times, reboot the 3DWOX to check on the EC pop-up.
* There may be a delay due to debris, but the Nozzle will get back to its normal status after several Nozzle checks.

  3) Check the Nozzle Sensor
  - Check the Nozzle Sensor by fully pushing the tip of the Nozzle Assy on the left. The filler, located on the bottom of the Nozzle, should move up and down.


  4) Check the Bed installation
  - Incomplete installation of the Bed can cause the EC 311 Error Code. Please check the complete installation of the Bed

[Error Code] EC 312, Print bed is not inserted
1) This probelm can occur when the print bed is not inserted.
2) It is a bug which can emerge on firmwares updated prior to 20160505_4. Please check the the version of your firmware and initiate an update if needed 
You may check the version of your firmware on the "info" menu under "3dwox lcd ui." The most recent version of the firmware can be downloaded through the website below.
Please use the below link to download the update firmware:

[Manuall Firmware update instructions]
1. Please open zip file and save the '_update_rodin' as root folder on a USB flash drive.
2. Insert the USB flash drive to the port located in the front of the machine.
3. Turn the machine on and update will start automatically.
4. Once the message " "!!!COMPLETE !!!" power off and remove usb." shows up
5. The update is complete.


[Error Code] EC 321 / EC 322, Nozzle fan control error
Please check if the Fan #1, 2 of the nozzle in the image below spins several times before Error Code 321, 322 message pops up. 

[1. Detach nozzle from the printer]
If it doesn't spin, please follow the instruction under 5-10 section on user guide to disassemble the nozzle (The user manual can be found at Downloads).

** user manual: 5. Maintenance - 4.4 Exchanging Nozzle - Detaching Nozzle
(= 3DWOX DP200 Manual / 3DWOX DP201 Manual)

[2. Confirm if there are any materials/obstacles that are disrupting the fan to operate properly]
- If the material/obstacle can be located, please try to remove it with tweezer.
- If the material/obstacle cannot be located, please see the airduct on the bottom side of the nozzle as well.
* Caution: The White, Black, Red cords inside are electrical cords, not the materials/obstacles that are disrupting the operation.


[3. Turn the fan manually to see if the material/obstacle has been removed]
See if it turns without any problem (There are 2 fans so please compare it with the other fan on the nozzle).

[4. Attach nozzle to the printer]
* user manual: 5. Maintenance - 4.4 Exchanging Nozzle - Assembling the Nozzle
* Please note that the 4th step to this instruction has been revised as in the below.
* Before -> Approx. 50mm of the tube is inserted. Push the tube in until the black indicator is unable to be seen.
* After -> Approx. 50mm of the tube is inserted. Push the tube in until the tube under the black indicator is unable to be seen. 

[5. Turn the power back on to see if the issue has been resolved]


[Error Code] EC 401, Extruder operation error

Follow the UI instructions and start the auto recovery process, after the recovery process if problem persists follow the below steps.

(If the problem persists after following the all three steps, please Contact Us.

 And let us know which step did you failed at first among three steps. )​ 


[STEP 1]  Unlock the Cartridge -> Remove the Cartridge from the Printer -> Go to Setting - Extruder mode and Press "100" as the transfer length and Press the arrow directed away from the Nozzle to remove the Filament completely from the printer. 
- Remove the Filament that is sticking out of the Cartridge (refer to the image below).
- Open the Cartridge and make sure that there are no entanglements inside the Filament spool (Separate manuals available for A Type and B Type Cartridges).

: A Type Cartridge                                         : B Type Cartridge​

 ​A Type Cartridge Manual                       ​ B Type Cartridge Manual


Reassemble the Cartridge and begin loading the filament. If Notification 476 Occurs, Press "No" and repeat the loading process. 

Cutting Filament Tip
 - When the ends of the Filament is sharp and acicular filament will run through easier.

- Please check that the end tip of the filament is properly transferred to the top of the Nozzle on the last part of the [STEP 1], Loading Process.
1. If the Filament is transferred properly, move on to [STEP 2].
2. If there is a problem during the process, please Contact Us with the details (including images and videos).      
[STEP 2]  Go to Setting - Extruder mode. Press "100" as the transfer length and Press the arrow directed towards the Nozzle.
Please make sure that the Filament is completely excreted from the Nozzle (If the Filament does not excrete from the Nozzle, Please Contact the Customer Service) 

- Please make sure that the Filament is properly excreted out of the Nozzle when the transfer length of 100 is selected and the arrow directed towards the Nozzle is pressed.
1. If the Filament is properly excreted, move on to [STEP 3].
2. If the Filament is not excreted, repeat [STEP 1] & [STEP 2] two to three times for recheck. If the problem persists, please Contact Us with the details(including images and videos).
[STEP 3]  Readjust the gap between the Bed and the Nozzle
   1) Remove the debris near the end tip of the Nozzle.
   2) Execute Setting - Bed Leveling
   3) Go to Setting - Z offset Menu to check and adjust the gap.( -> refer to the 3DWOX Z Offset Setting video)
   4) Press "Move" to adjust the gap between the Nozzle and the Bed and make sure that a paper with a thickness of 0.25 mm (Thickness of a Business Card or two sheets of paper folded) can pass through the gap. The optimal gap would be the paper slightly scratching the Nozzle tip.
   5) If the paper cannot pass through the gap or does not scratch the Nozzle tip , Press "+/-" to change the gap value(increase in value results in larger gap), Press "Save" and then Press "Move" to recheck the Gap. 

- Redo the printing. If the problems persist, please contact the Customer Service.

- Please check if the EC 401 reappears when printing.
If EC 401 reappears, please Contact Us with the details, including when the error occurred(images and videos), how often it occurred, material used (PLA or ABS), and the serial number.


[Error Code] EC 501, X axis motor or sensor error
1.Check the condition of a X-axis Sensor

(Location of a Sensor)
It is located where a dotted circle is above.

(Check the location of a Sensor)
A sensor is located inside the printer as shown in the picture above.

Check that the Sensor stays in position and whether it is properly assembled to the connector
(Left Picture) Normal - The sensor does not move when pushed inward.
(Right Picture) Abnormal - The sensor goes out of position when pushed inward.

2. If the Sensor is Out of Position

(Detach the Sensor)
Detach the Sensor completely

(Re-assemble the Sensor)
1.Re-assemble the Harness to the Connector
2.Tilt the Sensor and insert the lower part to the hole first.

(Sensor Re-assemble)
Finish re-assembling by inserting the upper part.


[Error Code] EC 502, Y axis motor or sensor error
There is a problem with the sensor for Y-axis. 
Please turn off the device and follow the steps

1. To check the sensor, adjust the bed as shown in the picture below.

Move the belt marked in the picture to pull the bed plate down.

Pull the belt in the direction shown in the picture.

When the bed moves down to certain level, pull the bed plate .

Check the Sensor behind the Bed Plate.

2. Please check the status of the Sensor

1) Please make sure the Harness is well connected.
2) Please remove anything stuck in the Sensor detector part

1-1) If the connector is disconnected, please connect it and reboot the printer

2-1) If anything is stuck near Sensor detector part as shown in the picture, remove it and reboot the printer.


Trouble Shooting

[Trouble Shooting] Use Rafts when Printing a Model with a Large Bottom Surface

1. Vulnerability in the Air Gap 

    When printing a model with a large bottom surface, it is highly unlikely to create the air gap between the raft and the main printout uniformly on all parts of the bottom surface.


    This non-uniformity of the air gap can partially cause the following problems.

     1) Difficult to remove the raft due to excessive close contact between the raft and the output (small air gap)

     2) The output bottom surface is uneven or shrinking due to weak adhesion between the raft and the output.


    In addition, in the case of cross-printing mode using dual nozzles, if the nozzle that prints the raft is different from the nozzle that prints the output, the possibility of such a problem increases.